Extranucleolar

Part of speech: adjective

Definitions

1. Located or occurring outside the nucleolus within a cell nucleus; pertaining to areas in the nucleus that do not include the nucleolus; describing structures or activities found externally to the nucleolus in cellular biology
2. Relating to cellular components or functions that exist beyond the nucleolus in the cell's nucleus; concerning regions not within the dense nucleolar area; referring to extranucleolar domains in microscopic anatomy
3. Characterizing elements or processes situated outside the central nucleolus part of a nucleus; indicating positions external to the nucleolus inside the nucleus; associated with the cellular nuclear regions excluding the nucleolus itself

Etymology: "Extranucleolar" is a plain technical formation: the Latin prefix "extra-", meaning "outside" or "beyond", joined to "nucleolar", the adjective from "nucleolus". The nucleolus itself takes its name from Latin "nucleolus", a diminutive of "nucleus", meaning "little kernel" or "little nut". Biologists applied the diminutive to the dense body inside a cell nucleus, which looks like a small kernel within a kernel. The word is a modern scientific coinage built from these classical parts, so it has no ancient usage. Its sense is literal: something described as extranucleolar lies outside that dense body, in the rest of the nucleus or in the cytoplasm. Its meaning follows directly from its parts, with no shift in sense along the way.

Synonyms: non-nucleolar, outside nucleolus